Fraunhofer WKI

Wood foam inside, concrete outside

Researchers of the Fraunhofer Institute for Wood Research (WKI) and TU Braunschweig have developed a sandwich element with wood-foam core and a thin cover layer made of textile-reinforced concrete. It can be used for curtain walls or in interior construction. In a previous research project, Fraunhofer WKI had already developed a wood foam which does not require artificial binding agents. Now, in cooperation with the TU Braunschweig, they have closely investigated the potential of the wood foam for practical applications in the construction industry.

Textile-reinforced concrete cover layers

Sandwich elements, as a combination of materials with a relatively thick and rigid core and a cover layer being as thin as possible, have a lot of advantages. They result in stiff and load-bearing components, which are nevertheless lightweight. As sandwich elements, moreover, provide for good thermal insulation and good noise protection, they are already frequently used in building construction.

The wood foam used for the core of the new sandwich elements exclusively consists of wood fibers. The relatively pressure-stable structural fixing of the wood fibers is achieved by means of the wood‘s own bonding forces.

Within the scope of the project, the researchers at the TU Braunschweig evaluated that different methods can be used for joining the wood-foam core to the cover layers made of textile-reinforced concrete. It is, for example, possible to pour the liquid concrete onto the wood-foam core. When using this method of joining, the sandwich elements are also suitable for interior and exterior applications. Due to direct pouring, there is no need for any adhesive. The project was funded by the „Zukunft Bau“ research initiative of the Federal Ministry for the Environment, Nature Conversation and Nuclear Safety.



Wilhelm-Klauditz-Institut WKI

Bienroder Weg 54 E

38108 Braunschweig /Germany

+49 531/2155 438">

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